Hiya & congrats on your impending birth
I agree with the advice already given. You will manage & as it's your first you get to sleep when baby sleeps! You will end up having broken sleep, for the first few weeks at least. How long it carries on all depends on the child as each one is different. My 1st & 3rd boys slept through from 5 weeks old, but my middle boy didn't sleep through until 8 months, which was a bit of a shock after my first born was so good!
Try & get some meals made up & frozen in advance so you won't have to spend time cooking meals when you could be resting. Accept any help offered & don't be afraid to tell people when you do & don't want visitors. It's a very tiring time & lots of people will want to visit but they will understand if you give them times they can & can't come round. You need your rest & so does little one!
It's a lovely experience & although it's tiring just try to enjoy it because they grow soooo fast!
Good luck for the birth